2009 Honda Fit Sport

Here is what I have done so far:

-Replaced Condenser

-Replaced Compressor (added 4oz oil and manually spun 20-30 times)

-Replaced Relay Under left Headlight

-Replaced Fuse 43 and 10

-Had Professionally Evac and Pressure test done

-Added R134a (15oz)

-Engaged Clutch by running a line from battery to Clutch Relay connector
(the clutch clicks on and spins, cold air blows)

What am I missing? The mechanic says my system is not leaking and the parts are all individually working, The light on my AC button turns on but the clutch does not engage on its own.

Please help, I live in Arizona.

 

I do not have an 09 wiring diagram but on most modern vehicles usually the BCM calls for the compressor to start by energizing the compressor relay. The BCM decides when start based on various imputs including some from the PCM, static and high side refrigerant pressure, outside temperature, etc.

I would stick a meter or test light on the line from the BCM to the relay to see if the BCM ever calls for the relay to energize. From there you can decide where to start looking next.

 

Sorry, what is the BCM and where is it typically located?

 

Check fuse 10 or whichever one runs the relays on a 09, the 7.5A fuse pops at the drop of a hat.. Its NOT the AC fuse its the control power fuse for pretty much a bunch of the relays in the car.. Its in the under dash fuse box.

 

The BCM is the Body Control Module or the body computer. Since I have no documentation here on an 09 FIT I can not tell you exactly where to probe it. I would instead probe the input to the compressor relay and see if you have it there rather than go trace it back to the BCM or what ever is triggering it.

On the compressor clutch relay you will have two leads for power in and power going to the compressor clutch. You will have two more leads going to the relay coil. It is those second two leads where you want to monitor for +12 VDC and ground.

Without a diagram I can not tell you if the relay is switched off and on on the +12vdc side or the -12VDC (ground) side. Usually these are supplied +12vdc all the time and the ground side of the coil is the switched side.

I'm sorry but I am really flying blind on this one without a 2009 diagram.

 

So far, Ive tested everything for pressure and its all good. Now I believe it is related to the A/C Pressure Switch. I haven't replaced it and the symptoms prior to the failure were consistent with it failing. 40 dollar part at O'reilly. Not at Autozone. Will check to see it fixes it and post results.

 

This may not be of much help but a similar thing happened to me;

I replaced my AC system with a chinese kit from eBay. No fuses were changed but I did put in a new expansion valve. Had it professionally vacuum checked and filled.

Afterwards the clutch would not engage, the mechanic that filled it said it could be some kind of electrical issue. I was quite upset after spending the money and doing all that work.

Somehow over the hour long drive home it just started to engage just a little and over the next few days it finally started to work properly.

Anyway, I hope you can get it working before it gets too hot

 

Yep, it was the connector on the compressor. The wire that controls the clutch engaging was fine. The wire that turns on the compressor was loose in the connector housing and would not work. Bell Honda in Phoenix only charged me half an hour to troubleshoot and he fixed the connector for free.

Thanks for the help, hopefully someone else can use this to avoid the same trouble.